What powers 
subterra.cz?
Last seen Oct 2026 · 14 technologies across 10 categories
Analytics
CDN
CMS
Databases
JavaScript libraries
Miscellaneous
Programming languages
SEO
Web frameworks
WordPress plugins
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Nov 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
- Oct 2026 *: Allowed (was Restricted)
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 66% phone
- 34% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.10 / 10 · ranked #507,122 of all domains
60 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Czech (Czechia)
- CDN: Cloudflare
- Weight: 1.8 MB · 26 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Subterra
- Founded: 1992
- Sector: construction industry
- Country: Czech Republic
- Profiles: Facebook, Instagram, LinkedIn, YouTube
From the homepage's own structured data (Oct 2026) and Wikidata (CC0).
Infrastructure
- Registered Jun 1998 (28 years) via INTERNET CZ, a.s., renews Oct 2027
- Hosted on Amazon Web Services (52.57.225.44)
- DNS: forpsi.cz
- Email: mx.microsoft
- Email security: SPF (soft fail), DMARC monitor only, DNSSEC signed
- SSL: SSL.com, ECDSA P256, expires Jan 2027
- Common Crawl link graph: rank 13,328,086, 3 hosts
- Verified with: Google, Microsoft 365, OpenAI
DNS records as swept Nov 2026, certificate as seen Oct 2026, registration from the registry's RDAP service. How the web is hosted
Full technology history →
Report an incorrect detection
Recent changes
- detected HTTP/3 Oct 2026